Detailed Explanation of Key Technical Points for Raising Pigs with Biogas Slurry and Biogas Residue

1. In a normally functioning biogas digester, use the mid-layer biogas slurry for feeding. Before feeding, take out an appropriate amount of biogas slurry and mix it into the feed. After the feed is mixed, let it stand for 3-5 minutes in summer, 15-20 minutes in spring and autumn, and 20-30 minutes in winter, then it can be fed to pigs.

2. The feeding amount should be determined according to the pig's different growth and development stages, body weight, feed intake and feeding habits.

① For young pigs weighing under 20 kg, it is generally not suitable to add biogas slurry and biogas residue for feeding.

② For medium pigs weighing 25 kg, biogas slurry feeding can begin. Feeding method: after routine epidemic prevention, deworming, stomach strengthening and castration, first starve them for 1-2 meals; after their appetite increases, add a small amount of biogas slurry and biogas residue to the feed and conduct palatability training for 3-5 days. After they adapt, feed 3-4 times a day, with 0.3-0.5 kg of biogas slurry each time, that is, the ratio of feed to biogas slurry should be kept at 10-20:1, and then gradually increased to 5:1.

③ For pigs weighing 50-100 kg, at this time the pig's bones develop rapidly and food intake increases, so the amount of biogas slurry increases. Generally, feed 3-4 times a day, with 0.6-1 kg each time, that is, the ratio of feed to biogas slurry is 4-3:1. If a small amount of bone meal and fish meal is added to the feed, weight gain will be faster. 3. Mix raw feed with biogas slurry and biogas residue into a semi-dry and semi-wet state. If the amount of biogas slurry is insufficient, clean water can be added separately. The feed should be measured so that the pigs finish it without leftovers. In addition, the amount used can be appropriately increased or decreased depending on the concentration of the biogas slurry.

Precautions

1. For newly built biogas digesters or those after a major refill, biogas slurry can be taken to feed pigs only after normal gas production and use for 3 months.

2. Biogas slurry from biogas digesters with abnormal gas production, no gas production, or toxic substances put into them is prohibited for feeding.

3. The feeding amount should be relatively stable. Do not add more just because the pigs like it very much, or add less or even none because they do not like it. This will disrupt the pigs' taste and is detrimental to their growth. 4. If too much biogas slurry is added, it will cause negative growth in pigs. Therefore, when starting to add biogas slurry to feed pigs, observe the pigs' dynamics, especially the shape of the feces. If diarrhea is found or the feces is cake-shaped, appropriately reduce the amount of biogas slurry or temporarily stop feeding. After the symptoms disappear, add biogas slurry for feeding again, but the added amount should be appropriately reduced, generally by 0.1 kg each time.

5. After sows give birth and wean, temporarily stop using added biogas slurry to raise pigs, to prevent excessive fattening. Pigs are best marketed at a body weight of about 120 kg, when the economic benefit is optimal.